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The Earth Story

@earthstory / earthstory.tumblr.com

This is the blog homepage of the Facebook group "The Earth Story" (Click here to visit our Facebook group). “The Earth Story” are group of volunteers with backgrounds throughout the Earth Sciences. We cover all Earth sciences - oceanography, climatology, geology, geophysics and much, much more. Our articles combine the latest research, stunning photography, and basic knowledge of geosciences, and are written for everyone!
We hope you find us to be a unique home for learning about the Earth sciences, and we hope you enjoy!
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King Tut's perfume bottle.

Our last post on selenite (http://tinyurl.com/poxxnj9), the transparent form of gypsum, mentioned the massive form of this mineral: alabaster. With the creamy whiteness of marble but alot softer and easier to carve, it was a favourite in antiquity for many kinds of object, from chests to handles, vases and perfume jars.

This example was discovered by Howard Carter last century during his excavation of the tomb of Tut Ankh Amun, an obscure pharaoh from the chaotic era at the end of the second intermediate period just after the politico-religious revolution of Akh En Aten. Shortly after the New Kingdom kicked off and the recent difficult times were 'deliberately' forgotten. Due to his obscurity and a dash of luck (tomb robbers never found it either), Carter deduced that his tomb must be somewhere in the Valley of the Kings, and, after some searching, the tomb was duly discovered.

Made of four cemented pieces of carved alabaster, it is carved with the names of the pharaoh and his wife (Ankh Shen Paten). The deities flanking the vase represent the Nile and its fertility in the form of Hapi, and their flowery headdresses represent upper (southern, lily) and lower (north and Nile delta, papyrus) Egypt.

Loz

Image credit, from the Cairo Museum: Frank Rydell

Source: facebook.com
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The cliffs of Étretat

The white cliffs of Dover are mirrored by these similar looking cliffs in upper Normandy, France. Along this 130 kilometer stretch of the so called Alabaster coast lies the small town of Étretat. Claude Monet and other Impressionists of the nineteenth century were attracted by the picturesque setting of the small village and famously painted the spectacular coastline.

Étretat is known for its three natural arches and white cliffs that tower high over the Atlantic Ocean. The Alabaster coast is actually made out of chalk and flint and not alabaster. It received its deceiving name due to the beautiful white color of the cliffs.

The Alabaster coast and the Cliffs of Dover have a similar geological history. The sedimentary remains of various marine microorganisms became accumulated over time and created these spectacular coastlines. In between the chalk are bands of flint which were derived from siliceous organisms.

The soft chalk is highly sensitive to erosion and under the effect of swell, frost, water seepage, wind and waves the cliffs are eroded about twenty centimeters a year. The chalk is rapidly dissolved in the sea whereas the flint forms the pebbles along the shore. The pebbles act as a natural barrier protecting the bottom of the cliffs against the waves. Furthermore, they are a valuable industrial resource which can be used in many ways.

Xandi

Image Credits: http://bit.ly/1MGSllu http://bit.ly/236hwCc Sources: http://bit.ly/1X2SccB http://bit.ly/1RC3eSL http://www.estrancitedelamer.fr/anglais/AFALAISE.htm

Source: facebook.com
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